"If land managers in Africa were as well funded as Yellowstone National Park, at around $4,100 per square kilometer, they could afford to manage the average unfenced lion population at around two- thirds its potential size, a step up from the current status quo. Despite the utility of ecotourism and trophy hunting for lion conservation in general, only a small proportion of that revenue typically becomes available to wildlife managers." — Jason G. Goldman​, Scientific American (April 2016), 314, 12-14 ​ Published online: 15 March 2016 | doi:10.1038/scientificamerican0416-12